Whitelisting IPs on the server – If your mail server supports whitelisting please update with the same IP’s as listed above. This is a different issue than firewall rules, as it is usually a rate limit or blacklist / whitelist on your mail server itself. Keywords: Greylisting, Whitelist, Throttle, Limit.

Your mail server is down – In this case please ignore this message (if you have already made sure that our IP’s are in your firewall / whitelist) And we will continue to queue your messages until your server comes back online or 10 days.

You can check the status of your messages by following these instructions: